71M6521BE Datasheet, PDF (5/97 Pages) Teridian Semiconductor Corporation – Energy Meter IC

71M6521BE
Energy Meter IC
DATA SHEET
JANUARY 2008
List of Figures
Figure 1: IC Functional Block Diagram...........................................................................................................................8
Figure 2: General Topology of a Chopped Amplifier ....................................................................................................11
Figure 3: AFE Block Diagram.......................................................................................................................................12
Figure 4: Samples from Multiplexer Cycle....................................................................................................................14
Figure 5: Accumulation Interval....................................................................................................................................15
Figure 6: Interrupt Structure .........................................................................................................................................36
Figure 7: Optical Interface ............................................................................................................................................39
Figure 8: Connecting an External Load to DIO Pins.....................................................................................................40
Figure 9: 3-Wire Interface. Write Command, HiZ=0. ....................................................................................................43
Figure 10: 3-Wire Interface. Write Command, HiZ=1 ...................................................................................................43
Figure 11: 3-Wire Interface. Read Command...............................................................................................................44
Figure 12: 3-Wire Interface. Write Command when CNT=0 .........................................................................................44
Figure 13: 3-Wire Interface. Write Command when HiZ=1 and WFR=1.......................................................................44
Figure 14: Functions defined by V1..............................................................................................................................45
Figure 15: Voltage. Current, Momentary and Accumulated Energy .............................................................................47
Figure 16: Timing Relationship between ADC MUX, Compute Engine, and Serial Transfers. .....................................48
Figure 17: RTM Output Format ....................................................................................................................................49
Figure 18: Operation Modes State Diagram.................................................................................................................50
Figure 19: Functional Blocks in BROWNOUT Mode (inactive blocks grayed out)........................................................52
Figure 20: Functional Blocks in LCD Mode (inactive blocks grayed out)......................................................................53
Figure 21: Functional Blocks in SLEEP Mode (inactive blocks grayed out) .................................................................54
Figure 22: Transition from BROWNOUT to MISSION Mode when System Power Returns .........................................55
Figure 23: Power-Up Timing with V3P3SYS and VBAT tied together ..........................................................................55
Figure 24: Power-Up Timing with VBAT only ...............................................................................................................56
Figure 25: Wake Up Timing..........................................................................................................................................57
Figure 26: MPU/CE Data Flow .....................................................................................................................................58
Figure 27: MPU/CE Communication ............................................................................................................................58
Figure 28: Resistive Voltage Divider (Left), Current Transformer (Right) .....................................................................60
Figure 29: Resistive Shunt ...........................................................................................................................................60
Figure 30: Connecting LCDs ........................................................................................................................................61
Figure 31: I²C EEPROM Connection............................................................................................................................63
Figure 32: Three-Wire EEPROM Connection...............................................................................................................63
Figure 33: Connections for the RX Pin .........................................................................................................................64
Figure 34: Connection for Optical Components ...........................................................................................................65
Figure 35: Voltage Divider for V1 .................................................................................................................................65
Figure 36: External Components for the RESET Pin: Push-Button (Left), EMI Circuit (Right) .....................................66
Figure 37: External Components for the Emulator Interface ........................................................................................66
Figure 38: Wh Accuracy, 0.1A to 200A at 240V/50Hz and Room Temperature...........................................................91
Figure 39: Meter Accuracy over Harmonics at 240V, 30A............................................................................................91
Figure 40: Typical Meter Accuracy over Temperature Relative to 25°C.......................................................................92
V1.0
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